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Turbo headers are especially prone to failure due to expansion and contraction stresses brought on by extreme heating and cooling cycles they are exposed to... elevated pressure ant temps that can be extreme in a turbo environment.... cracking and joint failure can happen VERY quickly...

this happens even with "Big Name" factory installations....

just ask any Porsche 951 Turbo owner...

Careful design and the incorporation of slip joints will help to insure longer life and service... here is a good example..